Internal anchor device for wells



Nov. 29, 1955 E. w. BAGNELL Re. 24,098

INTERNAL ANCHOR DEVICE FOR WELLS Original Filed March 9, 1950 50am? 4/.ens/vs IN VEN TOR.

yaw/11.6w.

24,098 INTERNAL ANCHOR DEVICE non WELLS Edgar W. Bagnell, Glendale,Calif., 'assignor, by mesne assignments, to Johnston Testers, Inc.,Houston, Tex.,

a corporation of Delaware N 2,662,601, datedjDecember 15, 1953, Serial0. 148,725, March 9, 1950. Application for reissue April 12, 1954,Serial No. 422,711

7 Claims. (Cl. 166-214) Matter enclosed in heavy brackets originalpatent v cation; matter printed 'in italics indicates made by reissue.

, o o [1 appears in the but forms no part of this reissue specifitheadditions This invention relates to an internal anchor device for wells.

In oil well production operations it is common practice to make sidewall tests. These tests insure that the testing device shall be held inthe well bore against longitudinal movement and rotation, and it is theprincipal object of the present invention to provide a device which ismanipulated from the top of the well and which may anchor a side walltesting tool within the well bore. The present invention contemplatesthe provision of a body structure and anchor means which may be movedinto engagement with a well bore to penetrate the same and to hold theentire structure against further operation during the time it istemporarily anchored.

The invention is illustrated by 'way of example in the accompanyingdrawing in which:

Figure 1 is a view in central longitudinal section showing thestructure. Fig. 2 is a view in vice as viewed in the transverse sectionthrough the dedirection indicated by the arrows operating position.

Fig. 3 is a longitudinal view in elevation showing the application ofthe present invention to a side wall tester. Fig. 4 is a transversesectional view similar to Fig. 2, showing the anchoring arms in theirwithdrawn or enclosed position.

Referring more particularly to the drawing, indicates a box'formed atthe upper end of a body member 117 This box is formed with a threadedsection 12 which receives the threaded pin 13 of a supporting structure14. This supporting structure may be a pipe, or it may be a section of aformation testing tool to which the entire assembly of an anchor may besecured. It is to be understood that above the anchor stucture may beprovided packers 15 of a side wall tester. In the present invention itis des'irable to anchor the lower structure so that the packers may beset. In someinstances the packers are disposed with openings 16 betweenthe packers so that fluid may flow into the string 14 from beneath thepacker. Bypass ports 17 are formed in the body 11 and communicating witha central upwardly extending opening 18. At the lower end of the body 11is a threaded pin 19 which extends into'the threaded bore of an innersleeve 20. The inner sleeve 20 is longitudinally mounted within an outersleeve 21.

The device is designed so that it will be anchored at a desired levelwithin the well bore, or so that it will rest on the bottom of thewellbore. When it is desired to be anchored at a point along the wellbore, dogs 22 are used. and when it is desired to be set at the bottomof the well bore, a nose 23 is provided which'rests directly upon thelower end of the bore in'the same manner as an anchor pipe. The dogs 22are mounted on pivot pin 24 which is carried by the inner sleeve 20.This sleeve is cut out, as

2-2 of Fig. 1 with the anchoring means spread to their v United StatesPatent 0 29 formed in the outer sleeve Re. 24,098 Reissued Nov. 29, 1955ice 2 indicated at 25, to accommodate the dogs and to permit them toswingf'rom vertical toward horizontal positions. The sleeve '20 has adownward extending portion 26 for the support of leaf springs 27. Thesesprings are pivotally mounted at their lower ends upon the support bypins 28.

The dogs 22 are movable to outwardly extending positions, as shown inFig. 2, through slot portions 25 formed aspart of the cut away portion25 of the sleeve 20 and slots 21, the slot portions 25' being movable toregister with the slots 29 as hereinafter explained.-

'The lower ends of the leaf springs may rest against a recessed shoulder26' on the extension 26 which tends to prevent the springs 27 fromswinging rearwardly while they are under tension tending to urge thedogs 22 outwardly and to bear against the outer sleeve 21. The dogs areformed with a blunt end 30 which may be forced outwardly into theformation, and an inclined face 31 which may move along the leaf springs27 if desired. In order to cause the dogs to move outwardly withrelation to the springs it is necessary to provide bow springs 32 whichextend longitudinally of the outer sleeve 21. The upper ends of the bowsprings 32 are fixed to collars 33 which slide longitudinally of theouter sleeve 21 and the lower ends of the springs 32 are fixed tocollars 34. The collars 34 are preferably welded in position so thatthey will not move relative to the outer sleeve 21. o

In order to hold the anchor mechanism in its retracted positions theouter sleeve 21 is'formed with a longitudinal slot 35 which is toreceive a pin 36. The pin 36 stands radially from the 'side of the innersleeve 20 and may seat normally in a recess 37. The upper end of theslot 35 is made with a transverse passageway 38 which may receive thepin 36 and allow it to travel from the slot 35 to the recess 37.

In operation of the present structure the side hole tester is attachedto the pin 13. It is preferably exposed below the lowermost packer 15.In the event it is operate on the bottom of the hole the nose 23 isrested on the bottom of the hole, and in the event it is desired to setthe side hole anchor at any desired depth in the open hole the entiretool may be lowered until the bow springs 32 are at a desired level. Ifthe bow springs are used the tool is lowered to a desired level for thebow springs, after which the body member 11 is lifted to raise the pin36 from the recess 37. The body and the inner sleeve are rotated in thedirection of the arrow a, as shown in Fig. l of the drawing, until thepin 36 is in register with the longitudinal portion 35 of the bayonetslot. When the pin has been rotated into alignment with the longitudinalslot 35 the free ends of the dogs 22 will be in longitudinal alignmentwith the slots 29 in the outer sleeve 21 and thereabove.

The inner sleeve 20 and the pin 36 are then lowered downwardly. In themeantime the bow springs will hold the outer sleeve 21 against rotationand longitudinal movement. The inner sleeve 20 is then moved downwardlyso that the pins 24 will force the dogs 22 downwardly and springs 27will cause the dogs to be forced outwardly through the slotted openings29 in the sleeve 21 to assume the position shown in Fig. 2 of thedrawing. When in this position the blunt ends 30 of the dogs 22 will beforced into the side walls of the open hole and will prevent furtherlongitudinal movement of the sleeve 21. This will make it possible forthe weight applied by the supporting string 14 to rest upon the packer15 and compress and expand the packer as desired. Fluid from theformation may then flow in through the transverse ports 17 to thecentral opening 18 and may then pass upwardly through the supportingstring 14 so that in the event a formation tester is disposed at anydistance along the length of the supporting string 14 the desired to thepacker to expand and compress fluid will be entrapped and a will also berecognized that if for any purpose it is desired to hold the sleeve 21against rotation the dogs 22 will penetrate the formation of the sidewalls, as shown in Fig. 2, so that rotation cannot be produced. It isunderstood that the bow springs 32 project outwardly into the well boresutficiently so that the springs will flex and engage the wallsfrictionally. This will cause the springs 32 to be compressed inwardlyand will force the collar 33 upwardly along the outer sleeve 21 whilethe lower ends of the springs are being held by the fixed collars 34. Ifit should be desired to set the side wall tester near the bottom of thehole the nose 23 may be caused to rest directly upon the end of thehole. The weight of the string may then rest upon the packers 15 of theside wall tester to enable them to be compressed and expanded asdesired. 1

It is to be understood that while the structure has been described asbeing used only with a lower packer 15 which will draw fluid from theformation through the ports 17,

sample will be taken. It

and through the passageway 16.

Attention is called to the fact that the slots 29 through the outersleeve 21 and designed to accommodate the dogs 22 are formed withlimiting shoulders 29' which will limit the upward swing of the dogs andallow the weight of the drill string to be imposed upon the dogs.

If it is desired to position the structure at a difierent 32 and dogs 22are pressed inwardly by the of slots 29 as inner sleeve 20 is raised bytubing 14. The tubing may or may not be rotated to latch the sleeve adrill string may be imposed upon the same, said structure being alsodesigned to permit the anchor to be easily released when desired.

While I have shown the tron as now known to me,

art, without departing from the spirit of the invention as claimed.

Having thus described my invention, what I claim and desire to secure byLetters Patent is:

1. An anchor for packers and the like, comprising a body structure, apair of swingably mounted dogs on the body structure spring-urged inopposite directions toward ceiving in the short vertical portion thebody structure, said sleeve having therein disposed downwardly andcircumferentially of the dogs when the pin of the J long verticalportion of.

2. An anchor for packers and the like, comprising a body structure, apair of dogs on the body structure swingably mounted for movement inopposite the walls of a well bore, and means frictionally engageablewith the Walls of the well bore including a sleeve rotatably carried bythe body structure and surrounding the dogs to relensably retain themagainst outward movement and having an inverted J slot formed thereinreceiving in the short vertical portion thereof a pin on the bodystructure, said sleeve having openings formed therein disposeddownwardly and circumferentially of the dogs when the pin is in theshort vertical portion of long vertical portion of the J slot to releasethe dogs.

3. An anchor for packers and the like, comprising a body structure, apair of dogs on the body structure the dogs, releasably restraining themagainst outward movement and having an inverted J-shaped slot formedtherein receiving in the short vertical portion thereof a said sleevehaving openings upon rotation of the body structure to cause the slot tobe brought into registery with the dog to release said dog.

5. An internal anchor device for wells comprising a body structure, atleast one dog mounted for outward movement toward the walls of registrywith the dog to release the dog.

6. An internal anchor device for wells comprising a dog to project toits wall engaging position,

' relative to said body in the opposite direction to retract said dog,means on the sleeve frictionally engageable with the walls of the wellbore to able the dogs to preiect to their wall engaging position,References Cited in the file of this patent said sleeve being adaptedwhen moved relative to said or the original patent body in the oppositedirection to retract said dogs, means UNITED STATES PATENTS on thesleeve fricttonally engageable with the walls at the well bore to retardmovement of said sleeve upon 5 1,034,963 Boutte g- 2 movement of saidbody structure and thereby cause rela- 1,124,602 Fuqua 6t 31 I 1915 tivemovement therebetween, and releasable latch means 2,231,767 Mason, 11,1941 for preventing relative longitudinal movement between 2,331,185 Q Y1943 said sleeve and said body, said latch means being releas- 2,428,139Bndwell at 31 P 30, 1947 able from the surface to permit said relativelongitudinal 10 2,482,985 LOCkWOOd P 9 movement, 2,605,843 e! Aug. 5,1952

